Coercivity mechanism of sintered NdFeB magnets having high coercivities

Journal Article · Tue May 01 04:00:00 EDT 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.344800· OSTI ID:7122522

Fukuno, A; Hirose, K; Yoneyama, T ^[1]

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1. TDK Company, Research and Development Center, Higashi-Ohwada, Ichikawa, Chiba 272, Japan (JP)

The combination of some additions and substitutions to sintered Nd-Fe-B magnets was investigated in order to obtain high coercivity and good thermal stability. Some additions (Al,Ga,Nb,W) and a substitution (Dy for Nd) give Nd-Fe-B-based sintered magnets high coercivities without a large remanence loss. Small differences in the amount of additions (Nd,Dy)-Fe-(Al,Ga)-(Nb,W)-B for sintered magnets show no significant difference in magnetic hysteresis loops at room temperature. Those magnet alloys also have similar good thermal stability. Effects of additions in the high-coercivity materials are studied by measuring coercivities and anisotropy fields as a function of temperature. The small amount of additions (Nb,W) affects the large influence to the coercivity mechanism.

• OSTI ID: 7122522
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 67:9; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALLOYS
BORIDES
BORON COMPOUNDS
COERCIVE FORCE
FABRICATION
HYSTERESIS
IRON BORIDES
IRON COMPOUNDS
MAGNETIC PROPERTIES
MAGNETS
NEODYMIUM BORIDES
NEODYMIUM COMPOUNDS
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
PERMANENT MAGNETS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SINTERING
STABILITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN ADDITIONS
TUNGSTEN ALLOYS